Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e8f8c2fe3b22fa8…

MALICIOUS

PDF

74.4 KB Created: 2021-04-02 01:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4623cfed544bd699b8c8582dc35f477 SHA-1: d36b798d443c293dcd4ffad4c1b7a04f3843d96a SHA-256: 8e8f8c2fe3b22fa861ff16f32ebbe849694f0b621ab50e137e39c20f9640375a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file that contains a large number of external links, identified as a PDF link farm. One of the primary URLs, 'https://resalured.ru/aws?utm_term=how+much+psi+for+a+brad+nailer', is suspicious and likely leads to a malicious site. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. No scripts were extracted, but the sheer volume of links suggests a coordinated effort to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://resalured.ru/aws?utm_term=how+much+psi+for+a+brad+nailer
    • https://boziwukajolefix.weebly.com/uploads/1/3/2/7/132711983/657630c545.pdf
    • https://kixofugowewo.weebly.com/uploads/1/3/1/8/131872146/481605c3e33.pdf
    • https://jatojuji.weebly.com/uploads/1/3/4/6/134649995/3779945.pdf
    • http://milansit.space/26079554596vfe2c.pdf
    • http://liginirudusupob.22web.org/advantages_of_authentic_assessment.pdf
    • http://tivoraxureb.22web.org/21312806391.pdf
    • http://femuloririv.iblogger.org/charlie_puth_how_long_song_free.pdf
    • https://sosedegif.weebly.com/uploads/1/3/2/8/132815053/losik.pdf
    • https://tujozidu.weebly.com/uploads/1/3/4/6/134694944/mofove-tugaxazudapunol-vaxerojakulogo-dunotarokele.pdf
    • http://plusstore.pro/rojedazobodijbgy.pdf
    • http://ideaita.fun/allianz_travel_insurance_claims_formee1lp.pdf
    • http://libotopatolar.iblogger.org/tamugaze.pdf
    • http://fasibada.22web.org/montagues_and_capulets_prokofiev_piano_sheet_music.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sekevidijonuji.rf.gd/sezigafokuxanuto.pdf
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_4dae3196ddc94d97b054473d9566aef1.pdf?index=true
    • http://melewurimepuja.rf.gd/bubbles_game_free.pdf
    • http://gijafusatuvaxoj.rf.gd/corporate_governance_role_in_financial_reporting.pdf
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_e7774ac5b9b8463d9a8b18b01e3a0d8b.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e30b.bin
6b417d4a1e8514928b9c61475680a985e40c524bcee2694d26067d501ebead27		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE30B 5588 bytes
font_01_sfnt_off0000f5ed.bin
0d350f0cdc267b51d8dff3ca262748ec1d5aa7453fe66cbe9ba65083ed52b078		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5ED 11324 bytes

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